Correct the serialization version for index field caps.

It needs to be lowered to 7.7 now that the PR has been backported.

Author: jtibshirani

rest-api-spec/src/main/resources/rest-api-spec/test/field_caps/10_basic.yml

@@ -106,9 +106,6 @@ setup:
 
 ---
 "Get simple field caps":
-  - skip:
-      version: "all"
-      reason: "Awaits fix: https://github.com/elastic/elasticsearch/issues/51896"
 
   - do:
       field_caps:
@@ -175,9 +172,6 @@ setup:
 
 ---
 "Get leaves field caps":
-  - skip:
-      version: "all"
-      reason: "Awaits fix: https://github.com/elastic/elasticsearch/issues/51896"
 
   - do:
       field_caps:
@@ -206,9 +200,6 @@ setup:
   - is_false: fields.object\.nested2.keyword.non_searchable_indices
 ---
 "Get object and nested field caps":
-  - skip:
-      version: "all"
-      reason: "Awaits fix: https://github.com/elastic/elasticsearch/issues/51896"
 
   - do:
       field_caps:
@@ -247,9 +238,6 @@ setup:
   - is_false: fields.level1\.level2\.leaf1.text..non_searchable_indices
 ---
 "Get prefix field caps":
-  - skip:
-      version: "all"
-      reason: "Awaits fix: https://github.com/elastic/elasticsearch/issues/51896"
 
   - do:
       field_caps:
@@ -268,9 +256,6 @@ setup:
 
 ---
 "Mix in non-existing field field caps":
-  - skip:
-      version: "all"
-      reason: "Awaits fix: https://github.com/elastic/elasticsearch/issues/51896"
 
   - do:
       field_caps:
@@ -311,11 +296,8 @@ setup:
 ---
 "Field caps with include_unmapped":
   - skip:
-      version: "all"
-      reason: "Awaits fix: https://github.com/elastic/elasticsearch/issues/51896"
-#  - skip:
-#      version: " - 7.1.99"
-#      reason: include_unmapped has been added in 7.2.0
+      version: " - 7.1.99"
+      reason: include_unmapped has been added in 7.2.0
 
   - do:
       field_caps:

rest-api-spec/src/main/resources/rest-api-spec/test/field_caps/20_meta.yml

@@ -1,11 +1,8 @@
 ---
 "Merge metadata across multiple indices":
   - skip:
-      version: "all"
-      reason: "Awaits fix: https://github.com/elastic/elasticsearch/issues/51896"
-#  - skip:
-#      version: " - 7.5.99"
-#      reason: Metadata support was added in 7.6
+      version: " - 7.5.99"
+      reason: Metadata support was added in 7.6
 
   - do:
         indices.create:

server/src/main/java/org/elasticsearch/action/fieldcaps/IndexFieldCapabilities.java

@@ -60,7 +60,7 @@ public class IndexFieldCapabilities implements Writeable {
     }
 
     IndexFieldCapabilities(StreamInput in) throws IOException {
-        if (in.getVersion().onOrAfter(Version.V_8_0_0)) {
+        if (in.getVersion().onOrAfter(Version.V_7_7_0)) {
             this.name = in.readString();
             this.type = in.readString();
             this.isSearchable = in.readBoolean();
@@ -81,7 +81,7 @@ public class IndexFieldCapabilities implements Writeable {
 
     @Override
     public void writeTo(StreamOutput out) throws IOException {
-        if (out.getVersion().onOrAfter(Version.V_8_0_0)) {
+        if (out.getVersion().onOrAfter(Version.V_7_7_0)) {
             out.writeString(name);
             out.writeString(type);
             out.writeBoolean(isSearchable);